March 2019 - Users - libvirt List Archives

[libvirt-users] why attach-disk can't be effective when the guest is booting
by Jianan Gao 07 Mar '19

07 Mar '19

Hi, When i use "virsh attach-device rhel disk.xml" when the guest is booting,then i can't find the disk in the guest after booting.But i can find it by "virsh domblklist rhel",and when i want to detach it from the guest and use "virsh detach-disk rhel vdb", i still can find the disk by "virsh domblklist rhel" The disk.xml is like: <disk type="file" device="disk"> <driver name='qemu' type='raw' cache='none'/> <source file="/var/lib/libvirt/images/foo.img"/> <target dev="vdb" bus="virtio"/> </disk> Libvirt-release is 5.0.0.4 and the qemu-kvm release is 3.1.0 So i want to know why it failed to attach-disk when booting,and why we design in this way.Maybe it's better to return failure if we can't use it like this.

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[libvirt-users] virsh hangs when backup jobs run on the kvm host
by Zhan Adlun 07 Mar '19

07 Mar '19

Hi, Has anyone met the same problem that virsh hangs when there are some backup jobs running on the kvm host? I use dirty bitmap supported by qemu to do backups every 6 minitues. About a few hours later, I ran 'virsh list', It hung. Then I stopped the backup jobs ，nothing was getting better. I had checked the libvirt logs ，but found nothing useful . Maybe the high I/O caused the problem? or there are connection number limits when using virsh, because I use virsh to check the backup jobs are still running every 10 seconds? My os version is ' Ubuntu 12.04 LTS Release: 12.04 Codename: precise,Linux version 4.1.0-generic (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #1 SMP Wed Nov 9 02:04:23 CST 2016'. KVM version is 'QEMU emulator version 2.7.1(Debian 1:2.7+dfsg-3)'. Hoping for you reply. Thanks!

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[libvirt-users] How do I close a console connection?
by Lars Kellogg-Stedman 05 Mar '19

05 Mar '19

I'm working on (re-) implementing serial console support in virtualbmc [1], and one of the issues I'm hitting right now is that after establishing a console connection via... self._stream = self._conn.newStream(libvirt.VIR_STREAM_NONBLOCK) self._domain.openConsole(None, self._stream, 0) ...I can't figure out how to close the console. Subsequent calls to openConsole fail because "a console connection is already open". I thought maybe I should close the stream, but that doesn't appear to be possible (there is a finish method, but it just tells me that "this function is not supported by the connection driver"). [1]: https://github.com/openstack/virtualbmc Cheers, -- Lars Kellogg-Stedman <lars(a)redhat.com> | larsks @ {irc,twitter,github} http://blog.oddbit.com/ |

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